CAJ | 학술논문

目的研究4种融合方法进行CT-MRI图像融合后的精度,为脑部肿瘤放疗患者寻求一种更有效的图像融合方法.方法选择10例脑部肿瘤患者,在相同定位条件下进行定位CT扫描和MRI T1W1增强序列扫描,分别用标点法、标点+手动融合法、互信息法和互信息+手动融合法将CT与MRI图像融合.分别在经融合过的CT和MRI图像上勾画临床靶体积(CTV),利用两种图像上相对应5个解剖点间距离平均值(d1-5)、CTV中心位置距离(dCTV)及CTV交叠度(PCT-MRI)评价图像融合精度,并用非参数Friedman M检验差异.结果标点法、标点+手动融合法、互信息法和互信息+手动融合法测得的d1-5不完全相同,分别为(0.28±0.12)、(0.15±0.02)、(0.25±0.19)、(0.10±0.06)cm(M=14.41,P=0.002);dCTV也不完全相同,分别为(0.59±0.28)、(0.60±0.32)、(0.58±0.39)、(0.42±0.30)cm(M=9.72,P=0.021);PCT-MRI也不完全相同,分别为0.69%±0.18%、0.68%±0.16%、0.66%±0.17%、0.74%±0.14%(M=14.82,P=0.002).结论采用互信息法+手动融合的方法所得d1-5、dCTV最小和PCT-MRI最大,用此方法进行图像融合具有较高融合精度,可用于脑部肿瘤患者临床放疗中.
목적 연구4충융합방법진행CT-MRI도상융합후적정도,위뇌부종류방료환자심구일충경유효적도상융합방법.방법 선택10례뇌부종류환자,재상동정위조건하진행정위CT소묘화MRI T1W1증강서렬소묘,분별용표점법、표점+수동융합법、호신식법화호신식+수동융합법장CT여MRI도상융합.분별재경융합과적CT화MRI도상상구화림상파체적(CTV),이용량충도상상상대응5개해부점간거리평균치(d1-5)、CTV중심위치거리(dCTV)급CTV교첩도(PCT-MRI)평개도상융합정도,병용비삼수Friedman M검험차이.결과 표점법、표점+수동융합법、호신식법화호신식+수동융합법측득적d1-5불완전상동,분별위(0.28±0.12)、(0.15±0.02)、(0.25±0.19)、(0.10±0.06)cm(M=14.41,P=0.002);dCTV야불완전상동,분별위(0.59±0.28)、(0.60±0.32)、(0.58±0.39)、(0.42±0.30)cm(M=9.72,P=0.021);PCT-MRI야불완전상동,분별위0.69%±0.18%、0.68%±0.16%、0.66%±0.17%、0.74%±0.14%(M=14.82,P=0.002).결론 채용호신식법+수동융합적방법소득d1-5、dCTV최소화PCT-MRI최대,용차방법진행도상융합구유교고융합정도,가용우뇌부종류환자림상방료중.
Objective To find an effective CT-MRI image fusion protocol in brain tumor by analyzing the registration accuracy of different methods. Methods The simulation CT scan and MRI T1 WI imaging of 10 brain tumor patients obtained with same position were registered by Tris-Axes landmark 、Tris-Axes landmark + manual adjustment、 mutual information and mutual information + manual adjustment method. The clinical tumor volume (CTV) were contoured on both CT and MRI images respectively. The accuracy of image fusion was assessed by the mean distance of five bone markers ( d1-5 ), central position of CTV ( dCTV ) the percentage of CTV overlap ( PCT-MRI ) between CT and MRI images. The difference between different methods was analyzed by Freidman M non-parameter test. Results The difference of the means d1-5 between the Tris-Axes landmark、Tris-Axes landmark plus manual adjustment、mutual information and mutual information plus manual adjustment methods were 0. 28 cm ±0. 12 cm, 0. 15 cm ±0.02 cm, 0. 25 cm± 0. 19 cm, 0. 10 cm ± 0. 06 cm, ( M = 14. 41, P = 0. 002 ). the means dCTV were 0. 59 cm ± 0. 28 cm,0. 60 cm± 0. 32 cm, 0. 58 cm ± 0. 39 cm, 0. 42 cm± 0. 30 cm( M = 9. 72, P = 0. 021 ), the means PCT-MRI were 0.69% ±0. 18%, 0.68% ±0. 16%, 0.66% ±0. 17%, 0.74% ±0. 14% (M = 14.82,P=0.002),respectively. Conclusions Mutual information plus manual adjustment registration method was the preferable fusion method for brain tumor patients.